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Approximation

What approximate value should come in place of the question mark(?) in the following question ? (Note that you are not expected to calculate the exact value).

  1. 125.009 + 69.999 + 104.989 = ?
    1. 420
    2. 300
    3. 285
    4. 415
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    125.009 + 69.999 + 104.989 = ?
    Lets assume, each value is approximated to nearest whole number
    ⇒ ? ≈ 125 + 70 + 105

    Correct Option: B

    125.009 + 69.999 + 104.989 = ?
    Lets assume, each value is approximated to nearest whole number
    ⇒ ? ≈ 125 + 70 + 105
    ⇒ ? ≈ 300

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  1. 16.003 x 27.998 - 209.010 = ?
    1. 150
    2. 200
    3. 75
    4. 240
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    ? = 16.003 x 27.998 - 209.010
    ? ≈ 16 x 28 - 210 = 448 - 210

    Correct Option: D

    ? = 16.003 x 27.998 - 209.010
    ? ≈ 16 x 28 - 210 = 448 - 210
    ? = 238 ≈ 240

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  1. 840.003 ÷ 23.999 = ?
    1. 47
    2. 8
    3. 35
    4. 18
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    ? = 840.003 ÷ 23.999
    Here one number is increased and other is decreased to their nearest whole number.

    Correct Option: C

    ? = 840.003 ÷ 23.999
    Here one number is increased and other is decreased to their nearest whole number
    = 840 ÷ 24 = 35

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  1. 6885.009 - 419.999 - 94.989 = ?
    1. 6650
    2. 6830
    3. 6370
    4. 6200
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    ? = 6885.009 - 419.999 - 94.989
    = 6885 - 420 - 95

    Correct Option: C

    ? = 6885.009 - 419.999 - 94.989
    = 6885 - 420 - 95 ≈ 6370

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  1. 503 x 201= ?
    1. 101100
    2. 1000000
    3. 110000
    4. 100003
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    530 x 201 = 101103

    Correct Option: A

    530 x 201 = 101103 ≈ 101100

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